Application: plasma-desktop (4.11.2)
KDE Platform Version: 4.11.2
Qt Version: 4.8.5
Operating System: Linux 3.11.6-4-desktop x86_64
Distribution: "openSUSE 13.1 (Bottle) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
Dragging the icon only task manager to the main panel.
When the icon is over the panel the panel crashed and totally dissapears. Occured before and after a restart.

I have added other widgets to panel such as Lancelot.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8987bc0780 (LWP 2383))]

Thread 3 (Thread 0x7f89674a0700 (LWP 2412)):
#0  0x00007f89864780af in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f897866b8cb in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f8978969f00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f897866b909 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f89864740db in start_thread () from /lib64/libpthread.so.0
#4  0x00007f89851dd90d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f88d8d15700 (LWP 2425)):
#0  0x00007f89851d4b3d in poll () from /lib64/libc.so.6
#1  0x00007f89820e85c4 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f89820e86cc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f8986837d76 in QEventDispatcherGlib::processEvents (this=0x313a310, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#4  0x00007f8986809d0f in QEventLoop::processEvents (this=this@entry=0x7f88d8d14e20, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f898680a005 in QEventLoop::exec (this=this@entry=0x7f88d8d14e20, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f8986708fef in QThread::exec (this=this@entry=0x31c8850) at thread/qthread.cpp:536
#7  0x00007f89867eb513 in QInotifyFileSystemWatcherEngine::run (this=0x31c8850) at io/qfilesystemwatcher_inotify.cpp:256
#8  0x00007f898670b68f in QThreadPrivate::start (arg=0x31c8850) at thread/qthread_unix.cpp:338
#9  0x00007f89864740db in start_thread () from /lib64/libpthread.so.0
#10 0x00007f89851dd90d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f8987bc0780 (LWP 2383)):
[KCrash Handler]
#6  0x00007f88e5821b5d in DeclarativeMimeData::DeclarativeMimeData (this=0x7fffa36a9bf0, copy=0x5009db0) at /usr/src/debug/kde-runtime-4.11.2/plasma/declarativeimports/draganddrop/DeclarativeMimeData.cpp:50
#7  0x00007f88e58214f1 in DeclarativeDragDropEvent::DeclarativeDragDropEvent (this=0x7fffa36a9bd0, e=0x7fffa36aa000, parent=0x275adf0) at /usr/src/debug/kde-runtime-4.11.2/plasma/declarativeimports/draganddrop/DeclarativeDragDropEvent.cpp:33
#8  0x00007f88e58215e4 in DeclarativeDropArea::dragLeaveEvent (this=0x275adf0, event=<optimized out>) at /usr/src/debug/kde-runtime-4.11.2/plasma/declarativeimports/draganddrop/DeclarativeDropArea.cpp:44
#9  0x00007f8985f2f312 in QGraphicsItem::sceneEvent (this=this@entry=0x275ae00, event=event@entry=0x7fffa36aa000) at graphicsview/qgraphicsitem.cpp:6729
#10 0x00007f8977e495c4 in QDeclarativeItem::sceneEvent (this=0x275adf0, event=0x7fffa36aa000) at graphicsitems/qdeclarativeitem.cpp:3047
#11 0x00007f8985f55e67 in QGraphicsScenePrivate::sendDragDropEvent (this=this@entry=0x2139130, item=0x275ae00, dragDropEvent=0x7fffa36aa000) at graphicsview/qgraphicsscene.cpp:1250
#12 0x00007f8985f55e9f in QGraphicsScene::dragLeaveEvent (this=<optimized out>, event=<optimized out>) at graphicsview/qgraphicsscene.cpp:3738
#13 0x00007f8985f6b590 in QGraphicsScene::event (this=0x224cef0, event=0x7fffa36aa000) at graphicsview/qgraphicsscene.cpp:3406
#14 0x00007f898598a8ac in QApplicationPrivate::notify_helper (this=this@entry=0x202e400, receiver=receiver@entry=0x224cef0, e=e@entry=0x7fffa36aa000) at kernel/qapplication.cpp:4562
#15 0x00007f8985990e70 in QApplication::notify (this=this@entry=0x201fa00, receiver=receiver@entry=0x224cef0, e=e@entry=0x7fffa36aa000) at kernel/qapplication.cpp:4348
#16 0x00007f89875b118a in KApplication::notify (this=0x201fa00, receiver=0x224cef0, event=0x7fffa36aa000) at /usr/src/debug/kdelibs-4.11.2/kdeui/kernel/kapplication.cpp:311
#17 0x00007f898680b0ad in QCoreApplication::notifyInternal (this=0x201fa00, receiver=0x224cef0, event=event@entry=0x7fffa36aa000) at kernel/qcoreapplication.cpp:949
#18 0x00007f8985f834a8 in sendEvent (event=0x7fffa36aa000, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231
#19 QGraphicsView::dragLeaveEvent (this=<optimized out>, event=0x7fffa36aa410) at graphicsview/qgraphicsview.cpp:2990
#20 0x00007f89859d9b67 in QWidget::event (this=this@entry=0x40ec230, event=event@entry=0x7fffa36aa410) at kernel/qwidget.cpp:8589
#21 0x00007f8985d76b6e in QFrame::event (this=0x40ec230, e=0x7fffa36aa410) at widgets/qframe.cpp:557
#22 0x00007f8985f82bd9 in QGraphicsView::viewportEvent (this=0x40ec230, event=0x7fffa36aa410) at graphicsview/qgraphicsview.cpp:2866
#23 0x00007f898680b216 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x202e400, receiver=receiver@entry=0x40f6a70, event=event@entry=0x7fffa36aa410) at kernel/qcoreapplication.cpp:1059
#24 0x00007f898598a88c in QApplicationPrivate::notify_helper (this=this@entry=0x202e400, receiver=receiver@entry=0x40f6a70, e=e@entry=0x7fffa36aa410) at kernel/qapplication.cpp:4558
#25 0x00007f8985991cfe in QApplication::notify (this=this@entry=0x201fa00, receiver=receiver@entry=0x40f6a70, e=e@entry=0x7fffa36aa410) at kernel/qapplication.cpp:4348
#26 0x00007f89875b118a in KApplication::notify (this=0x201fa00, receiver=0x40f6a70, event=0x7fffa36aa410) at /usr/src/debug/kdelibs-4.11.2/kdeui/kernel/kapplication.cpp:311
#27 0x00007f898680b0ad in QCoreApplication::notifyInternal (this=0x201fa00, receiver=0x40f6a70, event=0x7fffa36aa410) at kernel/qcoreapplication.cpp:949
#28 0x00007f8985a0e97e in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231
#29 QX11Data::xdndHandleLeave (this=0x7fffa36a9b40, w=0x5009db0, xe=0x7fffa36aa460) at kernel/qdnd_x11.cpp:1064
#30 0x00007f8985a0eac0 in qt_xdnd_send_leave () at kernel/qdnd_x11.cpp:1103
#31 0x00007f8985a0eeca in qt_xdnd_send_leave () at kernel/qdnd_x11.cpp:1406
#32 QDragManager::cancel (this=0x4d00c90, deleteSource=deleteSource@entry=false) at kernel/qdnd_x11.cpp:1407
#33 0x00007f898599b4ca in QDrag::~QDrag (this=0x48990a0, __in_chrg=<optimized out>) at kernel/qdrag.cpp:132
#34 0x00007f898599b4e9 in QDrag::~QDrag (this=0x48990a0, __in_chrg=<optimized out>) at kernel/qdrag.cpp:133
#35 0x00007f8986821658 in QObjectPrivate::deleteChildren (this=this@entry=0x460db60) at kernel/qobject.cpp:1916
#36 0x00007f89859d6617 in QWidget::~QWidget (this=0x45c3c70, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#37 0x00007f89859d6929 in QWidget::~QWidget (this=0x45c3c70, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1703
#38 0x00007f8986821658 in QObjectPrivate::deleteChildren (this=this@entry=0x45c3420) at kernel/qobject.cpp:1916
#39 0x00007f89859d6617 in QWidget::~QWidget (this=0x49602f0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#40 0x00007f8985f7cd35 in QGraphicsView::~QGraphicsView (this=0x49602f0, __in_chrg=<optimized out>) at graphicsview/qgraphicsview.cpp:1158
#41 0x00007f8985f7cd69 in QGraphicsView::~QGraphicsView (this=0x49602f0, __in_chrg=<optimized out>) at graphicsview/qgraphicsview.cpp:1164
#42 0x00007f8971955c04 in ControllerWindow::~ControllerWindow (this=0x474b470, __in_chrg=<optimized out>) at /usr/src/debug/kde-workspace-4.11.2/plasma/desktop/shell/controllerwindow.cpp:107
#43 0x00007f8971955c59 in ControllerWindow::~ControllerWindow (this=0x474b470, __in_chrg=<optimized out>) at /usr/src/debug/kde-workspace-4.11.2/plasma/desktop/shell/controllerwindow.cpp:108
#44 0x00007f8986823158 in QObject::event (this=this@entry=0x474b470, e=e@entry=0x3102b10) at kernel/qobject.cpp:1184
#45 0x00007f89859d9e4b in QWidget::event (this=0x474b470, event=0x3102b10) at kernel/qwidget.cpp:8846
#46 0x00007f898598a8ac in QApplicationPrivate::notify_helper (this=this@entry=0x202e400, receiver=receiver@entry=0x474b470, e=e@entry=0x3102b10) at kernel/qapplication.cpp:4562
#47 0x00007f8985990e70 in QApplication::notify (this=this@entry=0x201fa00, receiver=receiver@entry=0x474b470, e=e@entry=0x3102b10) at kernel/qapplication.cpp:4348
#48 0x00007f89875b118a in KApplication::notify (this=0x201fa00, receiver=0x474b470, event=0x3102b10) at /usr/src/debug/kdelibs-4.11.2/kdeui/kernel/kapplication.cpp:311
#49 0x00007f898680b0ad in QCoreApplication::notifyInternal (this=0x201fa00, receiver=receiver@entry=0x474b470, event=event@entry=0x3102b10) at kernel/qcoreapplication.cpp:949
#50 0x00007f898680e0ff in sendEvent (event=0x3102b10, receiver=0x474b470) at kernel/qcoreapplication.h:231
#51 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1f5b480) at kernel/qcoreapplication.cpp:1573
#52 0x00007f898680e5a3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1466
#53 0x00007f8986838493 in sendPostedEvents () at kernel/qcoreapplication.h:236
#54 postEventSourceDispatch (s=0x203eed0) at kernel/qeventdispatcher_glib.cpp:280
#55 0x00007f89820e82d6 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#56 0x00007f89820e8628 in ?? () from /usr/lib64/libglib-2.0.so.0
#57 0x00007f89820e86cc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#58 0x00007f8986837d55 in QEventDispatcherGlib::processEvents (this=0x204b9b0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#59 0x00007f8985a27936 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#60 0x00007f8986809d0f in QEventLoop::processEvents (this=this@entry=0x4b66180, flags=...) at kernel/qeventloop.cpp:149
#61 0x00007f898680a005 in QEventLoop::exec (this=this@entry=0x4b66180, flags=...) at kernel/qeventloop.cpp:204
#62 0x00007f8985a112fd in QDragManager::drag (this=0x4d00c90, o=o@entry=0x48990a0) at kernel/qdnd_x11.cpp:2028
#63 0x00007f898599b72a in QDrag::exec (this=this@entry=0x48990a0, supportedActions=..., defaultDropAction=Qt::MoveAction) at kernel/qdrag.cpp:284
#64 0x00007f88e58213a8 in DeclarativeDragArea::mouseMoveEvent (this=0x507e910, event=<optimized out>) at /usr/src/debug/kde-runtime-4.11.2/plasma/declarativeimports/draganddrop/DeclarativeDragArea.cpp:233
#65 0x00007f88e5821461 in DeclarativeDragArea::sceneEventFilter (this=0x507e910, item=0x50f73c0, event=0x7fffa36ab410) at /usr/src/debug/kde-runtime-4.11.2/plasma/declarativeimports/draganddrop/DeclarativeDragArea.cpp:245
#66 0x00007f8985f516e5 in QGraphicsScenePrivate::filterDescendantEvent (this=this@entry=0x2139130, item=item@entry=0x50f73c0, event=event@entry=0x7fffa36ab410) at graphicsview/qgraphicsscene.cpp:1159
#67 0x00007f8985f55d4e in QGraphicsScenePrivate::sendEvent (this=0x2139130, item=0x50f73c0, event=0x7fffa36ab410) at graphicsview/qgraphicsscene.cpp:1211
#68 0x00007f8985f5624f in QGraphicsScenePrivate::sendMouseEvent (this=0x2139130, mouseEvent=0x7fffa36ab410) at graphicsview/qgraphicsscene.cpp:1295
#69 0x00007f8985f5f586 in QGraphicsScene::mouseMoveEvent (this=<optimized out>, mouseEvent=0x7fffa36ab410) at graphicsview/qgraphicsscene.cpp:4102
#70 0x00007f8985f6b3fc in QGraphicsScene::event (this=0x224cef0, event=0x7fffa36ab410) at graphicsview/qgraphicsscene.cpp:3451
#71 0x00007f898598a8ac in QApplicationPrivate::notify_helper (this=this@entry=0x202e400, receiver=receiver@entry=0x224cef0, e=e@entry=0x7fffa36ab410) at kernel/qapplication.cpp:4562
#72 0x00007f8985990e70 in QApplication::notify (this=this@entry=0x201fa00, receiver=receiver@entry=0x224cef0, e=e@entry=0x7fffa36ab410) at kernel/qapplication.cpp:4348
#73 0x00007f89875b118a in KApplication::notify (this=0x201fa00, receiver=0x224cef0, event=0x7fffa36ab410) at /usr/src/debug/kdelibs-4.11.2/kdeui/kernel/kapplication.cpp:311
#74 0x00007f898680b0ad in QCoreApplication::notifyInternal (this=0x201fa00, receiver=0x224cef0, event=event@entry=0x7fffa36ab410) at kernel/qcoreapplication.cpp:949
#75 0x00007f8985989246 in sendSpontaneousEvent (event=event@entry=0x7fffa36ab410, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:234
#76 qt_sendSpontaneousEvent (receiver=<optimized out>, event=event@entry=0x7fffa36ab410) at kernel/qapplication.cpp:5560
#77 0x00007f8985f8067c in QGraphicsViewPrivate::mouseMoveEventHandler (this=this@entry=0x45c3420, event=event@entry=0x7fffa36aba60) at graphicsview/qgraphicsview.cpp:646
#78 0x00007f8985f8158a in QGraphicsView::mouseMoveEvent (this=0x49602f0, event=0x7fffa36aba60) at graphicsview/qgraphicsview.cpp:3276
#79 0x00007f89859d9f25 in QWidget::event (this=this@entry=0x49602f0, event=event@entry=0x7fffa36aba60) at kernel/qwidget.cpp:8361
#80 0x00007f8985d76b6e in QFrame::event (this=0x49602f0, e=0x7fffa36aba60) at widgets/qframe.cpp:557
#81 0x00007f8985f82bd9 in QGraphicsView::viewportEvent (this=0x49602f0, event=0x7fffa36aba60) at graphicsview/qgraphicsview.cpp:2866
#82 0x00007f898680b216 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x202e400, receiver=receiver@entry=0x45c3c70, event=event@entry=0x7fffa36aba60) at kernel/qcoreapplication.cpp:1059
#83 0x00007f898598a88c in QApplicationPrivate::notify_helper (this=this@entry=0x202e400, receiver=receiver@entry=0x45c3c70, e=e@entry=0x7fffa36aba60) at kernel/qapplication.cpp:4558
#84 0x00007f8985990fad in QApplication::notify (this=this@entry=0x201fa00, receiver=receiver@entry=0x45c3c70, e=e@entry=0x7fffa36aba60) at kernel/qapplication.cpp:4105
#85 0x00007f89875b118a in KApplication::notify (this=0x201fa00, receiver=0x45c3c70, event=0x7fffa36aba60) at /usr/src/debug/kdelibs-4.11.2/kdeui/kernel/kapplication.cpp:311
#86 0x00007f898680b0ad in QCoreApplication::notifyInternal (this=0x201fa00, receiver=receiver@entry=0x45c3c70, event=event@entry=0x7fffa36aba60) at kernel/qcoreapplication.cpp:949
#87 0x00007f8985990763 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231
#88 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x45c3c70, event=event@entry=0x7fffa36aba60, alienWidget=alienWidget@entry=0x45c3c70, nativeWidget=nativeWidget@entry=0x474b470, buttonDown=buttonDown@entry=0x7f8986468278 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3173
#89 0x00007f8985a01f7b in QETWidget::translateMouseEvent (this=this@entry=0x474b470, event=event@entry=0x7fffa36abdd0) at kernel/qapplication_x11.cpp:4528
#90 0x00007f8985a009ec in QApplication::x11ProcessEvent (this=0x201fa00, event=event@entry=0x7fffa36abdd0) at kernel/qapplication_x11.cpp:3651
#91 0x00007f8985a27882 in x11EventSourceDispatch (s=0x203f0e0, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#92 0x00007f89820e82d6 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#93 0x00007f89820e8628 in ?? () from /usr/lib64/libglib-2.0.so.0
#94 0x00007f89820e86cc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#95 0x00007f8986837d55 in QEventDispatcherGlib::processEvents (this=0x204b9b0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#96 0x00007f8985a27936 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#97 0x00007f8986809d0f in QEventLoop::processEvents (this=this@entry=0x7fffa36ac1b0, flags=...) at kernel/qeventloop.cpp:149
#98 0x00007f898680a005 in QEventLoop::exec (this=this@entry=0x7fffa36ac1b0, flags=...) at kernel/qeventloop.cpp:204
#99 0x00007f898680f13b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221
#100 0x00007f898598906c in QApplication::exec () at kernel/qapplication.cpp:3823
#101 0x00007f897196488c in kdemain (argc=1, argv=0x1f9d8b0) at /usr/src/debug/kde-workspace-4.11.2/plasma/desktop/shell/main.cpp:126
#102 0x000000000040879e in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 326140.

Possible duplicates by query: bug 326694, bug 326339, bug 326140, bug 320682.

Reported using DrKonqi